Clamping mechanism



H. JOHANSEN.

CLAMPING MECHANISM.

APPLICATION FILED NOV.28, 1917.

1,355,082, Patented 001.51920.

20 QZ E1/ver "ar:

UNITED STATES PATENT, OFFICE..

HARRY JOHANSEN, 0F CHICAGO, ILLINOIS, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CURPORATION OF MASSACHUSETTS. i

CLAMPING MECHANISM.

Specification of Letters Patent.

Patented Oct. 5, 1920.

Application led November 28, v1917. Serial No. 204,457.

To all whom t may concer/1t.

Be it known that I HARRY JoHANsnN, a citizen of the United VStates, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Clamping Mechanisms, of which the following is a full, clear, and exact specification.

My invention relates to clamping mechanisms. v

It has for its object to provide improved work clamping means whereby the friction is decreased and the power required to operate the mechanism is thus materially reduced.l A more specific object of my invention is to provide improved work clamping mechanism wherein through the use of improved means for absorbingV the thrust of the clamp operating mechanism, the above ends are attained. These and other objects and advantages of my improvement will, however, hereinafter more fully appear.

In the accompanying drawings, I have shown for purposes of illustration one embodiment which my invention may assume in practice. Y

In these drawings,-

Figure 1 isa side elevation of` a standard type of forging machine equipped with my improvement, certain parts being broken away to show the clamp operating mechamsm.

Fig. 2 is a detail sectional View taken substantially on line 2-2 of Fig. 1, showing the clamp and clamp operating mechanism.

Fig. 3 is a fragmentary view of the operating mechanism in a different position.

In this illustrative construction, I have shown in simplified form a forging machine adapted to the manufacture and sharpening of drill bits, which is of a type now manufactured commercially. As illustrated, this machine comprises a frame or base l carrying thereon a suitable stationary clamping die 2 and a vertically reciprocable clamping die 3, the latter being carried by and between spaced parallel columns 4 reciprocable in the frame to move the upper clamping die 3 to and from its clamping position. As in the commercial construction mentioned, these columns are also connected at their lower ends to a crosshead 5 movable in suitable guideways in the frame and connected through a toggle link 6 with a reciprocating member or block 7, in turn connected to a piston 8 movable in a suitable cylinder 9 under the control of valve mechanism 10 controllable by a valve controlling lever 11. As usual, the base l also carries a horizontally disposed percussive motor 12 adapted to operate a dolly 13 to act upon the work clamped between the clamping dies, this motor also being controlled by the controlling lever 1l through the valve mechanism 10. It will also be observed that, as in the usual commercial construction, another percussive motor 14 is provided on a suitable vertical standard 15 to reciprocate a movable swaging die 16 relative to a stationary swaging die 17 carried on the frame 1, the motor lbeing controlled through suitable controlling mechanism including a footlever 18.

In my improvement, it will be observed that I have provided an overhanging link 19 pivotally connected to the toggle link 6 by a pin 20 at a point intermediate theends of the link 6 and also suitably pivotally con- Vnested at 2l to the frame l at a higher point side of the longitudinal center line thereof,v

the pivot of the same preferably being odset and disposed relative to the link 6 substantially as shown in Fig. 1.

In the operation of my improved construction, it will be observed that the toggle mechanism will be controlled in substantially the same manner in which it now op` erates in the type of machine hereinbefore referred to, the same being set, under the control of the valve mechanism 10 and 11, when the piston 8 is reciprocated toward the right in the cylinder 9, and broken when the piston is reciprocated in the opposite direction. More specifically, it will be observed that with the parts in the clamping position shown in Fig. 1, the lower end of the link 19 l in such a manner as materially to reduce used for purposes of illustration and thaty is freely movable upward with the link 6 to the non-clamping position thereof shown in Fig. 3, and that when the operation of the parts is reversed thelink 19 transmits the thrust to the frame l and simultaneously vswings downward about its pivot to the clamping position shown. e

In my improved construction wherein the link 19. moves` about aV fixed pivot on the trame l, it will ybe observed that due to the action of the link 19 the Vthrust of the clamp operating mechanism is taken by the frame the friction of the parts and enable the same Vtobe operated with far greater facility. ln

Y ciency oiP the mechanism has 'been materially increased. i 7 7. I

lVhile have in this application specificallyY described one embodimentl which my invention may assume in practice, it will be understood that thisjform of the same is the invention may obviously be modified and embodied Vin various other forms without de- ,v

parting from its spirit or the scope of the appended claims. Y

Vhat I claim as new and desire to'secure i by Letters Patent is:V

Y 'l'. In combination with Va movable clamp y member, a member reciprocable ina straight line, a link pivoted at one end thereto, said link being pivoted at its opposite end to the movableV clamp member, and 'a second link pivotedto said iirst mentioned .link at a point between the ends thereof and outside aline connecting the iirst mentioned pivot points, said second mentioned link having also ay iiXed pivotal connection.

,2. in combination, a frame, clamping mechanism thereon including a reciprocable member, a second member reciprocable Vat ,right angles to said irst mentioned member,

a link pivoted to each or said members, and a second lnik `pivotedat one end to saidfirst mentioned link 'and between the ends thereof Y y and outsidea line connecting' the pivots,vsaid second mentioned link having its otherV end pivoted to said-iframe, the upperv pivot points of said links being on opposite sides Yoi' aV of thelower end of said first mentioned link when the parts areinclamping position.

In testimony whereof I'affix, my signature. p p Y HARRYJOHANSEN.

V vertical line passin^ through the pivot point a y Y 

